How to choose a certified document translation service in Thailand
Short answer
In Thailand the translation itself is never the deciding factor — the seal attached to it is. A translation used inside Thailand normally needs certification by the Department of Consular Affairs, Ministry of Foreign Affairs. A translation sent abroad needs whatever the receiving authority names: an embassy-sworn translation, a NAATI translation for Australia, or a notarised translator affidavit. Confirm the required seal before ordering the translation.
Almost every rejected translation in Thailand fails for the same reason: the wording was fine, but the certification layer was wrong for the receiving authority. Thai district offices, immigration, the Department of Business Development and the courts do not audit translation quality directly — they check whose seal is on the document and whether that seal is one they are instructed to accept.
There are four distinct certification routes in practice. First, an in-house certified translation with the translator's declaration, which is enough for many internal, corporate and informal uses. Second, legalisation of the translation by the Department of Consular Affairs, Ministry of Foreign Affairs, which is the standard requirement for Thai government use. Third, a sworn or embassy-endorsed translation, which some embassies require for their own visa or civil-registration files. Fourth, a NAATI translation, which is the Australian requirement for documents submitted to Australian government bodies.
The routes are not interchangeable and they are not a quality ladder. A NAATI translation carries no weight at a Thai district office, and a Ministry of Foreign Affairs certification carries no weight with the Australian Department of Home Affairs. Paying for the higher-priced option does not make it correct.
Thailand acceded to the Hague Apostille Convention in 2026 and the Convention enters into force for Thailand on 28 February 2027. From that date, documents travelling between Thailand and other contracting states will use a single Apostille instead of the double embassy chain. The translation step itself does not disappear: a Thai-language document going abroad still needs a translation the receiving authority accepts, and a foreign document coming into Thailand still needs a Thai translation certified by the Department of Consular Affairs.
How to judge a provider
1. They ask where the document will be filed before quoting
The receiving authority determines the certification route. A provider who quotes a per-page price without asking whether the file goes to a Thai district office, a foreign embassy in Bangkok, or an authority overseas is quoting for the wrong product about half the time.
2. Name spelling is matched to your existing records
Thai civil registration matches people by exact string. A romanised or Thai spelling that differs from your passport, work permit or previous Thai certificates creates a second identity in the file and is a leading cause of rejection. Ask how they source the spelling — the correct answer is from your earlier documents, not from a fresh transliteration.
3. The translator is named and traceable
Certified work must identify who translated it. An unsigned translation, or one signed only with a company stamp, cannot be verified by the authority reviewing it and is frequently returned.
4. Turnaround is stated in working days
Standard certification at the Department of Consular Affairs takes roughly two to three working days after submission; same-day express service exists at a higher government fee. Any provider promising a fixed hour-count without naming the government queue is describing their own desk time, not the real timeline.
5. Government fees and service fees are itemised separately
Legalisation fees are set by the Ministry of Foreign Affairs and paid to the government; translation and courier work are the provider's own charge. A single blended figure hides which part is negotiable and which is fixed by regulation.
6. They translate from the sealed original, not from an English relay
For German, French, Japanese, Chinese, Korean, Russian or Arabic source documents, the reviewing officer compares your Thai text against the sealed original. A translation produced from an intermediate English version introduces drift that shows up on comparison.
7. You receive scans of every certification layer
The same document set is normally reused across visa, work permit, marriage registration and bank-account steps. A provider who returns only the final paper copy forces you to pay for the chain again on the next application.
Which option fits your case
Certified translation with MFA legalisation
Best for: Documents filed with Thai government offices — district office, immigration, DBD, courts
The Department of Consular Affairs seal is the only certification Thai agencies uniformly recognise on a translation.
View this service →NAATI translation
Best for: Documents submitted to Australian government bodies, universities and visa applications
Australian authorities require translations by NAATI-credentialled translators; other certifications are not substitutes.
View this service →Sworn / embassy-endorsed translation
Best for: Files going to embassies that maintain their own translator lists or endorsement requirements
Some missions accept only translations they have endorsed themselves, regardless of MFA certification.
View this service →Court translation
Best for: Evidence, pleadings, foreign judgments and hearings before Thai courts
Court filings follow the court's own admissibility rules and often require an interpreter on the hearing date as well.
View this service →Technical and contractual translation
Best for: Agreements, technical files, compliance and tender documents
Terminology consistency across a document set matters more than certification for commercial use.
View this service →Full service catalogue
Best for: You are not sure which certification level applies
The catalogue lists every translation and certification variant in one place so you can compare before contacting us.
View this service →
Comparison
| Destination of the document | Certification required | Who applies the seal |
|---|---|---|
| Thai district office, immigration, DBD, courts | Certified translation legalised by the Ministry of Foreign Affairs | Department of Consular Affairs, MFA |
| Australian government, universities, visa files | NAATI translation | NAATI-credentialled translator |
| Embassy in Bangkok with its own translator list | Sworn or embassy-endorsed translation | The embassy concerned |
| Foreign authority in a Hague contracting state (from 28 Feb 2027) | Translation plus Apostille on the underlying document | Department of Consular Affairs, MFA |
| Internal corporate, banking or informational use | Certified translation with translator declaration | The translation provider |
The correct order of steps
Step 1 — Ask the receiving authority which certification it accepts
Get it in writing where possible — an email or a printed checklist. Requirements differ between embassies and between Thai agencies, and staff guidance changes.
Step 2 — Check the condition of the source document
Most authorities work from an original or a certified true copy. A photograph, a photocopy without certification, or an expired extract will be rejected before the translation is even read.
Step 3 — Fix the name spelling before translation starts
Supply your passport and any previous Thai-language document so the spelling matches the existing record exactly.
Step 4 — Complete the translation and certification in the right order
Certification always follows the translation and is applied to the paired original-and-translation set, not to the translation alone.
Step 5 — Keep a full scan set of every layer
Store the original, the translation and each seal. The same set is normally reused in later visa, work permit or registration steps.
Mistakes that cause rejection
✕ Ordering a NAATI translation for a Thai district office
✓ Thai agencies require MFA-legalised translations; NAATI is the Australian route only.
✕ Translating from a scan of a scan
✓ Work from the original or a properly certified true copy so the reviewing officer can compare against a sealed source.
✕ Changing the spelling of a name to something more accurate
✓ Match the spelling already on record, even if it is imperfect. Consistency is what the registry checks.
✕ Booking a flight or an appointment before the certification queue is known
✓ Confirm the working-day estimate for standard and express certification first, then book.
✕ Assuming the Apostille already applies in Thailand
✓ The Convention enters into force for Thailand on 28 February 2027; until then the embassy legalisation chain remains in use.
Frequently asked questions
What is a certified translation in Thailand?
A translation accompanied by a signed declaration identifying the translator and confirming the text corresponds to the original. For Thai government use it normally needs the additional step of legalisation by the Department of Consular Affairs, Ministry of Foreign Affairs.
Does the Ministry of Foreign Affairs check translation quality?
The Department of Consular Affairs compares the translation against the original and refuses submissions with substantive discrepancies, but its certification is primarily an authentication of the document chain rather than a quality rating.
Is a NAATI translation accepted in Thailand?
Not as a substitute for Thai certification. NAATI credentials are recognised by Australian authorities. A document used in Thailand needs a Thai translation certified by the Department of Consular Affairs.
How long does certification take?
Standard processing at the Department of Consular Affairs is generally two to three working days after submission, with a same-day express option at a higher government fee. Total time depends on translation length and the current queue.
Will the Apostille remove the need for translation?
No. An Apostille authenticates the origin of a public document. A Thai authority will still require a Thai translation, and a foreign authority will still require a translation into its own working language.
Can I translate my own documents?
Self-translation is not accepted for official filings. The certifying authority needs an identifiable third-party translator who takes responsibility for the text.
What happens if a name is spelled differently across documents?
The registry treats it as a mismatch and normally suspends the application until a supporting document reconciles the two spellings. Fixing the spelling before translation avoids the delay entirely.
How do I get a price?
Pricing depends on language pair, page count, certification route and urgency, so we quote after seeing the document. Send a scan by email or LINE, or call the office and speak to the translation desk.
Talk to us before you file
Phone 083-249-4999 · Translation desk 081-562-0444 · LINE @NYC168 · contact@ilc.ltd
General information reviewed at the date shown on this site. It is not legal advice for an individual case, and approval always remains at the discretion of the reviewing authority.